/* * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. * * Copyright (c) 2001-2004 Anton Altaparmakov * Copyright (c) 2001,2002 Richard Russon * * This program/include file is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program/include file is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (in the main directory of the Linux-NTFS * distribution in the file COPYING); if not, write to the Free Software * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/stddef.h> #include <linux/init.h> #include <linux/string.h> #include <linux/spinlock.h> #include <linux/blkdev.h> /* For bdev_hardsect_size(). */ #include <linux/backing-dev.h> #include <linux/buffer_head.h> #include <linux/vfs.h> #include <linux/moduleparam.h> #include <linux/smp_lock.h> #include "sysctl.h" #include "logfile.h" #include "quota.h" #include "dir.h" #include "debug.h" #include "index.h" #include "aops.h" #include "malloc.h" #include "ntfs.h" /* Number of mounted file systems which have compression enabled. */ static unsigned long ntfs_nr_compression_users; /* A global default upcase table and a corresponding reference count. */ static ntfschar *default_upcase = NULL; static unsigned long ntfs_nr_upcase_users = 0; /* Error constants/strings used in inode.c::ntfs_show_options(). */ typedef enum { /* One of these must be present, default is ON_ERRORS_CONTINUE. */ ON_ERRORS_PANIC = 0x01, ON_ERRORS_REMOUNT_RO = 0x02, ON_ERRORS_CONTINUE = 0x04, /* Optional, can be combined with any of the above. */ ON_ERRORS_RECOVER = 0x10, } ON_ERRORS_ACTIONS; const option_t on_errors_arr[] = { { ON_ERRORS_PANIC, "panic" }, { ON_ERRORS_REMOUNT_RO, "remount-ro", }, { ON_ERRORS_CONTINUE, "continue", }, { ON_ERRORS_RECOVER, "recover" }, { 0, NULL } }; /** * simple_getbool - * * Copied from old ntfs driver (which copied from vfat driver). */ static int simple_getbool(char *s, BOOL *setval) { if (s) { if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true")) *setval = TRUE; else if (!strcmp(s, "0") || !strcmp(s, "no") || !strcmp(s, "false")) *setval = FALSE; else return 0; } else *setval = TRUE; return 1; } /** * parse_options - parse the (re)mount options * @vol: ntfs volume * @opt: string containing the (re)mount options * * Parse the recognized options in @opt for the ntfs volume described by @vol. */ static BOOL parse_options(ntfs_volume *vol, char *opt) { char *p, *v, *ov; static char *utf8 = "utf8"; int errors = 0, sloppy = 0; uid_t uid = (uid_t)-1; gid_t gid = (gid_t)-1; mode_t fmask = (mode_t)-1, dmask = (mode_t)-1; int mft_zone_multiplier = -1, on_errors = -1; int show_sys_files = -1, case_sensitive = -1; struct nls_table *nls_map = NULL, *old_nls; /* I am lazy... (-8 */ #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ if (!strcmp(p, option)) { \ if (!v || !*v) \ variable = default_value; \ else { \ variable = simple_strtoul(ov = v, &v, 0); \ if (*v) \ goto needs_val; \ } \ } #define NTFS_GETOPT(option, variable) \ if (!strcmp(p, option)) { \ if (!v || !*v) \ goto needs_arg; \ variable = simple_strtoul(ov = v, &v, 0); \ if (*v) \ goto needs_val; \ } #define NTFS_GETOPT_BOOL(option, variable) \ if (!strcmp(p, option)) { \ BOOL val; \ if (!simple_getbool(v, &val)) \ goto needs_bool; \ variable = val; \ } #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ if (!strcmp(p, option)) { \ int _i; \ if (!v || !*v) \ goto needs_arg; \ ov = v; \ if (variable == -1) \ variable = 0; \ for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ if (!strcmp(opt_array[_i].str, v)) { \ variable |= opt_array[_i].val; \ break; \ } \ if (!opt_array[_i].str || !*opt_array[_i].str) \ goto needs_val; \ } if (!opt || !*opt) goto no_mount_options; ntfs_debug("Entering with mount options string: %s", opt); while ((p = strsep(&opt, ","))) { if ((v = strchr(p, '='))) *v++ = 0; NTFS_GETOPT("uid", uid) else NTFS_GETOPT("gid", gid) else NTFS_GETOPT("umask", fmask = dmask) else NTFS_GETOPT("fmask", fmask) else NTFS_GETOPT("dmask", dmask) else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier) else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE) else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files) else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive) else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors, on_errors_arr) else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes")) ntfs_warning(vol->sb, "Ignoring obsolete option %s.", p); else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) { if (!strcmp(p, "iocharset")) ntfs_warning(vol->sb, "Option iocharset is " "deprecated. Please use " "option nls=<charsetname> in " "the future."); if (!v || !*v) goto needs_arg; use_utf8: old_nls = nls_map; nls_map = load_nls(v); if (!nls_map) { if (!old_nls) { ntfs_error(vol->sb, "NLS character set " "%s not found.", v); return FALSE; } ntfs_error(vol->sb, "NLS character set %s not " "found. Using previous one %s.", v, old_nls->charset); nls_map = old_nls; } else /* nls_map */ { if (old_nls) unload_nls(old_nls); } } else if (!strcmp(p, "utf8")) { BOOL val = FALSE; ntfs_warning(vol->sb, "Option utf8 is no longer " "supported, using option nls=utf8. Please " "use option nls=utf8 in the future and " "make sure utf8 is compiled either as a " "module or into the kernel."); if (!v || !*v) val = TRUE; else if (!simple_getbool(v, &val)) goto needs_bool; if (val) { v = utf8; goto use_utf8; } } else { ntfs_error(vol->sb, "Unrecognized mount option %s.", p); if (errors < INT_MAX) errors++; } #undef NTFS_GETOPT_OPTIONS_ARRAY #undef NTFS_GETOPT_BOOL #undef NTFS_GETOPT #undef NTFS_GETOPT_WITH_DEFAULT } no_mount_options: if (errors && !sloppy) return FALSE; if (sloppy) ntfs_warning(vol->sb, "Sloppy option given. Ignoring " "unrecognized mount option(s) and continuing."); /* Keep this first! */ if (on_errors != -1) { if (!on_errors) { ntfs_error(vol->sb, "Invalid errors option argument " "or bug in options parser."); return FALSE; } } if (nls_map) { if (vol->nls_map && vol->nls_map != nls_map) { ntfs_error(vol->sb, "Cannot change NLS character set " "on remount."); return FALSE; } /* else (!vol->nls_map) */ ntfs_debug("Using NLS character set %s.", nls_map->charset); vol->nls_map = nls_map; } else /* (!nls_map) */ { if (!vol->nls_map) { vol->nls_map = load_nls_default(); if (!vol->nls_map) { ntfs_error(vol->sb, "Failed to load default " "NLS character set."); return FALSE; } ntfs_debug("Using default NLS character set (%s).", vol->nls_map->charset); } } if (mft_zone_multiplier != -1) { if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != mft_zone_multiplier) { ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " "on remount."); return FALSE; } if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " "Using default value, i.e. 1."); mft_zone_multiplier = 1; } vol->mft_zone_multiplier = mft_zone_multiplier; } if (!vol->mft_zone_multiplier) vol->mft_zone_multiplier = 1; if (on_errors != -1) vol->on_errors = on_errors; if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) vol->on_errors |= ON_ERRORS_CONTINUE; if (uid != (uid_t)-1) vol->uid = uid; if (gid != (gid_t)-1) vol->gid = gid; if (fmask != (mode_t)-1) vol->fmask = fmask; if (dmask != (mode_t)-1) vol->dmask = dmask; if (show_sys_files != -1) { if (show_sys_files) NVolSetShowSystemFiles(vol); else NVolClearShowSystemFiles(vol); } if (case_sensitive != -1) { if (case_sensitive) NVolSetCaseSensitive(vol); else NVolClearCaseSensitive(vol); } return TRUE; needs_arg: ntfs_error(vol->sb, "The %s option requires an argument.", p); return FALSE; needs_bool: ntfs_error(vol->sb, "The %s option requires a boolean argument.", p); return FALSE; needs_val: ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov); return FALSE; } #ifdef NTFS_RW /** * ntfs_write_volume_flags - write new flags to the volume information flags * @vol: ntfs volume on which to modify the flags * @flags: new flags value for the volume information flags * * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() * instead (see below). * * Replace the volume information flags on the volume @vol with the value * supplied in @flags. Note, this overwrites the volume information flags, so * make sure to combine the flags you want to modify with the old flags and use * the result when calling ntfs_write_volume_flags(). * * Return 0 on success and -errno on error. */ static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) { ntfs_inode *ni = NTFS_I(vol->vol_ino); MFT_RECORD *m; VOLUME_INFORMATION *vi; ntfs_attr_search_ctx *ctx; int err; ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.", le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); if (vol->vol_flags == flags) goto done; BUG_ON(!ni); m = map_mft_record(ni); if (IS_ERR(m)) { err = PTR_ERR(m); goto err_out; } ctx = ntfs_attr_get_search_ctx(ni, m); if (!ctx) { err = -ENOMEM; goto put_unm_err_out; } err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, ctx); if (err) goto put_unm_err_out; vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + le16_to_cpu(ctx->attr->data.resident.value_offset)); vol->vol_flags = vi->flags = flags; flush_dcache_mft_record_page(ctx->ntfs_ino); mark_mft_record_dirty(ctx->ntfs_ino); ntfs_attr_put_search_ctx(ctx); unmap_mft_record(ni); done: ntfs_debug("Done."); return 0; put_unm_err_out: if (ctx) ntfs_attr_put_search_ctx(ctx); unmap_mft_record(ni); err_out: ntfs_error(vol->sb, "Failed with error code %i.", -err); return err; } /** * ntfs_set_volume_flags - set bits in the volume information flags * @vol: ntfs volume on which to modify the flags * @flags: flags to set on the volume * * Set the bits in @flags in the volume information flags on the volume @vol. * * Return 0 on success and -errno on error. */ static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) { flags &= VOLUME_FLAGS_MASK; return ntfs_write_volume_flags(vol, vol->vol_flags | flags); } /** * ntfs_clear_volume_flags - clear bits in the volume information flags * @vol: ntfs volume on which to modify the flags * @flags: flags to clear on the volume * * Clear the bits in @flags in the volume information flags on the volume @vol. * * Return 0 on success and -errno on error. */ static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) { flags &= VOLUME_FLAGS_MASK; flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); return ntfs_write_volume_flags(vol, flags); } #endif /* NTFS_RW */ /** * ntfs_remount - change the mount options of a mounted ntfs filesystem * @sb: superblock of mounted ntfs filesystem * @flags: remount flags * @opt: remount options string * * Change the mount options of an already mounted ntfs filesystem. * * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, * @sb->s_flags are not changed. */ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) { ntfs_volume *vol = NTFS_SB(sb); ntfs_debug("Entering with remount options string: %s", opt); #ifndef NTFS_RW /* For read-only compiled driver, enforce all read-only flags. */ *flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; #else /* NTFS_RW */ /* * For the read-write compiled driver, if we are remounting read-write, * make sure there are no volume errors and that no unsupported volume * flags are set. Also, empty the logfile journal as it would become * stale as soon as something is written to the volume and mark the * volume dirty so that chkdsk is run if the volume is not umounted * cleanly. Finally, mark the quotas out of date so Windows rescans * the volume on boot and updates them. * * When remounting read-only, mark the volume clean if no volume errors * have occured. */ if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { static const char *es = ". Cannot remount read-write."; /* Remounting read-write. */ if (NVolErrors(vol)) { ntfs_error(sb, "Volume has errors and is read-only%s", es); return -EROFS; } if (vol->vol_flags & VOLUME_IS_DIRTY) { ntfs_error(sb, "Volume is dirty and read-only%s", es); return -EROFS; } if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { ntfs_error(sb, "Volume has unsupported flags set and " "is read-only%s", es); return -EROFS; } if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { ntfs_error(sb, "Failed to set dirty bit in volume " "information flags%s", es); return -EROFS; } #if 0 // TODO: Enable this code once we start modifying anything that // is different between NTFS 1.2 and 3.x... /* Set NT4 compatibility flag on newer NTFS version volumes. */ if ((vol->major_ver > 1)) { if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { ntfs_error(sb, "Failed to set NT4 " "compatibility flag%s", es); NVolSetErrors(vol); return -EROFS; } } #endif if (!ntfs_empty_logfile(vol->logfile_ino)) { ntfs_error(sb, "Failed to empty journal $LogFile%s", es); NVolSetErrors(vol); return -EROFS; } if (!ntfs_mark_quotas_out_of_date(vol)) { ntfs_error(sb, "Failed to mark quotas out of date%s", es); NVolSetErrors(vol); return -EROFS; } } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { /* Remounting read-only. */ if (!NVolErrors(vol)) { if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) ntfs_warning(sb, "Failed to clear dirty bit " "in volume information " "flags. Run chkdsk."); } } #endif /* NTFS_RW */ // TODO: Deal with *flags. if (!parse_options(vol, opt)) return -EINVAL; ntfs_debug("Done."); return 0; } /** * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector * @sb: Super block of the device to which @b belongs. * @b: Boot sector of device @sb to check. * @silent: If TRUE, all output will be silenced. * * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot * sector. Returns TRUE if it is valid and FALSE if not. * * @sb is only needed for warning/error output, i.e. it can be NULL when silent * is TRUE. */ static BOOL is_boot_sector_ntfs(const struct super_block *sb, const NTFS_BOOT_SECTOR *b, const BOOL silent) { /* * Check that checksum == sum of u32 values from b to the checksum * field. If checksum is zero, no checking is done. */ if ((void*)b < (void*)&b->checksum && b->checksum) { le32 *u; u32 i; for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) i += le32_to_cpup(u); if (le32_to_cpu(b->checksum) != i) goto not_ntfs; } /* Check OEMidentifier is "NTFS " */ if (b->oem_id != magicNTFS) goto not_ntfs; /* Check bytes per sector value is between 256 and 4096. */ if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) goto not_ntfs; /* Check sectors per cluster value is valid. */ switch (b->bpb.sectors_per_cluster) { case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: break; default: goto not_ntfs; } /* Check the cluster size is not above 65536 bytes. */ if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * b->bpb.sectors_per_cluster > 0x10000) goto not_ntfs; /* Check reserved/unused fields are really zero. */ if (le16_to_cpu(b->bpb.reserved_sectors) || le16_to_cpu(b->bpb.root_entries) || le16_to_cpu(b->bpb.sectors) || le16_to_cpu(b->bpb.sectors_per_fat) || le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) goto not_ntfs; /* Check clusters per file mft record value is valid. */ if ((u8)b->clusters_per_mft_record < 0xe1 || (u8)b->clusters_per_mft_record > 0xf7) switch (b->clusters_per_mft_record) { case 1: case 2: case 4: case 8: case 16: case 32: case 64: break; default: goto not_ntfs; } /* Check clusters per index block value is valid. */ if ((u8)b->clusters_per_index_record < 0xe1 || (u8)b->clusters_per_index_record > 0xf7) switch (b->clusters_per_index_record) { case 1: case 2: case 4: case 8: case 16: case 32: case 64: break; default: goto not_ntfs; } /* * Check for valid end of sector marker. We will work without it, but * many BIOSes will refuse to boot from a bootsector if the magic is * incorrect, so we emit a warning. */ if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55)) ntfs_warning(sb, "Invalid end of sector marker."); return TRUE; not_ntfs: return FALSE; } /** * read_ntfs_boot_sector - read the NTFS boot sector of a device * @sb: super block of device to read the boot sector from * @silent: if true, suppress all output * * Reads the boot sector from the device and validates it. If that fails, tries * to read the backup boot sector, first from the end of the device a-la NT4 and * later and then from the middle of the device a-la NT3.51 and before. * * If a valid boot sector is found but it is not the primary boot sector, we * repair the primary boot sector silently (unless the device is read-only or * the primary boot sector is not accessible). * * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized * to their respective values. * * Return the unlocked buffer head containing the boot sector or NULL on error. */ static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, const int silent) { const char *read_err_str = "Unable to read %s boot sector."; struct buffer_head *bh_primary, *bh_backup; long nr_blocks = NTFS_SB(sb)->nr_blocks; /* Try to read primary boot sector. */ if ((bh_primary = sb_bread(sb, 0))) { if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) bh_primary->b_data, silent)) return bh_primary; if (!silent) ntfs_error(sb, "Primary boot sector is invalid."); } else if (!silent) ntfs_error(sb, read_err_str, "primary"); if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { if (bh_primary) brelse(bh_primary); if (!silent) ntfs_error(sb, "Mount option errors=recover not used. " "Aborting without trying to recover."); return NULL; } /* Try to read NT4+ backup boot sector. */ if ((bh_backup = sb_bread(sb, nr_blocks - 1))) { if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) bh_backup->b_data, silent)) goto hotfix_primary_boot_sector; brelse(bh_backup); } else if (!silent) ntfs_error(sb, read_err_str, "backup"); /* Try to read NT3.51- backup boot sector. */ if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) { if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) bh_backup->b_data, silent)) goto hotfix_primary_boot_sector; if (!silent) ntfs_error(sb, "Could not find a valid backup boot " "sector."); brelse(bh_backup); } else if (!silent) ntfs_error(sb, read_err_str, "backup"); /* We failed. Cleanup and return. */ if (bh_primary) brelse(bh_primary); return NULL; hotfix_primary_boot_sector: if (bh_primary) { /* * If we managed to read sector zero and the volume is not * read-only, copy the found, valid backup boot sector to the * primary boot sector. */ if (!(sb->s_flags & MS_RDONLY)) { ntfs_warning(sb, "Hot-fix: Recovering invalid primary " "boot sector from backup copy."); memcpy(bh_primary->b_data, bh_backup->b_data, sb->s_blocksize); mark_buffer_dirty(bh_primary); sync_dirty_buffer(bh_primary); if (buffer_uptodate(bh_primary)) { brelse(bh_backup); return bh_primary; } ntfs_error(sb, "Hot-fix: Device write error while " "recovering primary boot sector."); } else { ntfs_warning(sb, "Hot-fix: Recovery of primary boot " "sector failed: Read-only mount."); } brelse(bh_primary); } ntfs_warning(sb, "Using backup boot sector."); return bh_backup; } /** * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol * @vol: volume structure to initialise with data from boot sector * @b: boot sector to parse * * Parse the ntfs boot sector @b and store all imporant information therein in * the ntfs super block @vol. Return TRUE on success and FALSE on error. */ static BOOL parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) { unsigned int sectors_per_cluster_bits, nr_hidden_sects; int clusters_per_mft_record, clusters_per_index_record; s64 ll; vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); vol->sector_size_bits = ffs(vol->sector_size) - 1; ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size, vol->sector_size); ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits, vol->sector_size_bits); if (vol->sector_size != vol->sb->s_blocksize) ntfs_warning(vol->sb, "The boot sector indicates a sector size " "different from the device sector size."); ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster); sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; ntfs_debug("sectors_per_cluster_bits = 0x%x", sectors_per_cluster_bits); nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects); vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; vol->cluster_size_mask = vol->cluster_size - 1; vol->cluster_size_bits = ffs(vol->cluster_size) - 1; ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size, vol->cluster_size); ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask); ntfs_debug("vol->cluster_size_bits = %i (0x%x)", vol->cluster_size_bits, vol->cluster_size_bits); if (vol->sector_size > vol->cluster_size) { ntfs_error(vol->sb, "Sector sizes above the cluster size are " "not supported. Sorry."); return FALSE; } if (vol->sb->s_blocksize > vol->cluster_size) { ntfs_error(vol->sb, "Cluster sizes smaller than the device " "sector size are not supported. Sorry."); return FALSE; } clusters_per_mft_record = b->clusters_per_mft_record; ntfs_debug("clusters_per_mft_record = %i (0x%x)", clusters_per_mft_record, clusters_per_mft_record); if (clusters_per_mft_record > 0) vol->mft_record_size = vol->cluster_size << (ffs(clusters_per_mft_record) - 1); else /* * When mft_record_size < cluster_size, clusters_per_mft_record * = -log2(mft_record_size) bytes. mft_record_size normaly is * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). */ vol->mft_record_size = 1 << -clusters_per_mft_record; vol->mft_record_size_mask = vol->mft_record_size - 1; vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size, vol->mft_record_size); ntfs_debug("vol->mft_record_size_mask = 0x%x", vol->mft_record_size_mask); ntfs_debug("vol->mft_record_size_bits = %i (0x%x)", vol->mft_record_size_bits, vol->mft_record_size_bits); /* * We cannot support mft record sizes above the PAGE_CACHE_SIZE since * we store $MFT/$DATA, the table of mft records in the page cache. */ if (vol->mft_record_size > PAGE_CACHE_SIZE) { ntfs_error(vol->sb, "Mft record size %i (0x%x) exceeds the " "page cache size on your system %lu (0x%lx). " "This is not supported. Sorry.", vol->mft_record_size, vol->mft_record_size, PAGE_CACHE_SIZE, PAGE_CACHE_SIZE); return FALSE; } clusters_per_index_record = b->clusters_per_index_record; ntfs_debug("clusters_per_index_record = %i (0x%x)", clusters_per_index_record, clusters_per_index_record); if (clusters_per_index_record > 0) vol->index_record_size = vol->cluster_size << (ffs(clusters_per_index_record) - 1); else /* * When index_record_size < cluster_size, * clusters_per_index_record = -log2(index_record_size) bytes. * index_record_size normaly equals 4096 bytes, which is * encoded as 0xF4 (-12 in decimal). */ vol->index_record_size = 1 << -clusters_per_index_record; vol->index_record_size_mask = vol->index_record_size - 1; vol->index_record_size_bits = ffs(vol->index_record_size) - 1; ntfs_debug("vol->index_record_size = %i (0x%x)", vol->index_record_size, vol->index_record_size); ntfs_debug("vol->index_record_size_mask = 0x%x", vol->index_record_size_mask); ntfs_debug("vol->index_record_size_bits = %i (0x%x)", vol->index_record_size_bits, vol->index_record_size_bits); /* * Get the size of the volume in clusters and check for 64-bit-ness. * Windows currently only uses 32 bits to save the clusters so we do * the same as it is much faster on 32-bit CPUs. */ ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits; if ((u64)ll >= 1ULL << 32) { ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry."); return FALSE; } vol->nr_clusters = ll; ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters); /* * On an architecture where unsigned long is 32-bits, we restrict the * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler * will hopefully optimize the whole check away. */ if (sizeof(unsigned long) < 8) { if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { ntfs_error(vol->sb, "Volume size (%lluTiB) is too " "large for this architecture. " "Maximum supported is 2TiB. Sorry.", (unsigned long long)ll >> (40 - vol->cluster_size_bits)); return FALSE; } } ll = sle64_to_cpu(b->mft_lcn); if (ll >= vol->nr_clusters) { ntfs_error(vol->sb, "MFT LCN is beyond end of volume. Weird."); return FALSE; } vol->mft_lcn = ll; ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn); ll = sle64_to_cpu(b->mftmirr_lcn); if (ll >= vol->nr_clusters) { ntfs_error(vol->sb, "MFTMirr LCN is beyond end of volume. " "Weird."); return FALSE; } vol->mftmirr_lcn = ll; ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn); #ifdef NTFS_RW /* * Work out the size of the mft mirror in number of mft records. If the * cluster size is less than or equal to the size taken by four mft * records, the mft mirror stores the first four mft records. If the * cluster size is bigger than the size taken by four mft records, the * mft mirror contains as many mft records as will fit into one * cluster. */ if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) vol->mftmirr_size = 4; else vol->mftmirr_size = vol->cluster_size >> vol->mft_record_size_bits; ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size); #endif /* NTFS_RW */ vol->serial_no = le64_to_cpu(b->volume_serial_number); ntfs_debug("vol->serial_no = 0x%llx", (unsigned long long)vol->serial_no); return TRUE; } /** * ntfs_setup_allocators - initialize the cluster and mft allocators * @vol: volume structure for which to setup the allocators * * Setup the cluster (lcn) and mft allocators to the starting values. */ static void ntfs_setup_allocators(ntfs_volume *vol) { #ifdef NTFS_RW LCN mft_zone_size, mft_lcn; #endif /* NTFS_RW */ ntfs_debug("vol->mft_zone_multiplier = 0x%x", vol->mft_zone_multiplier); #ifdef NTFS_RW /* Determine the size of the MFT zone. */ mft_zone_size = vol->nr_clusters; switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ case 4: mft_zone_size >>= 1; /* 50% */ break; case 3: mft_zone_size = (mft_zone_size + (mft_zone_size >> 1)) >> 2; /* 37.5% */ break; case 2: mft_zone_size >>= 2; /* 25% */ break; /* case 1: */ default: mft_zone_size >>= 3; /* 12.5% */ break; } /* Setup the mft zone. */ vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; ntfs_debug("vol->mft_zone_pos = 0x%llx", (unsigned long long)vol->mft_zone_pos); /* * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs * source) and if the actual mft_lcn is in the expected place or even * further to the front of the volume, extend the mft_zone to cover the * beginning of the volume as well. This is in order to protect the * area reserved for the mft bitmap as well within the mft_zone itself. * On non-standard volumes we do not protect it as the overhead would * be higher than the speed increase we would get by doing it. */ mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; if (mft_lcn * vol->cluster_size < 16 * 1024) mft_lcn = (16 * 1024 + vol->cluster_size - 1) / vol->cluster_size; if (vol->mft_zone_start <= mft_lcn) vol->mft_zone_start = 0; ntfs_debug("vol->mft_zone_start = 0x%llx", (unsigned long long)vol->mft_zone_start); /* * Need to cap the mft zone on non-standard volumes so that it does * not point outside the boundaries of the volume. We do this by * halving the zone size until we are inside the volume. */ vol->mft_zone_end = vol->mft_lcn + mft_zone_size; while (vol->mft_zone_end >= vol->nr_clusters) { mft_zone_size >>= 1; vol->mft_zone_end = vol->mft_lcn + mft_zone_size; } ntfs_debug("vol->mft_zone_end = 0x%llx", (unsigned long long)vol->mft_zone_end); /* * Set the current position within each data zone to the start of the * respective zone. */ vol->data1_zone_pos = vol->mft_zone_end; ntfs_debug("vol->data1_zone_pos = 0x%llx", (unsigned long long)vol->data1_zone_pos); vol->data2_zone_pos = 0; ntfs_debug("vol->data2_zone_pos = 0x%llx", (unsigned long long)vol->data2_zone_pos); /* Set the mft data allocation position to mft record 24. */ vol->mft_data_pos = 24; ntfs_debug("vol->mft_data_pos = 0x%llx", (unsigned long long)vol->mft_data_pos); #endif /* NTFS_RW */ } #ifdef NTFS_RW /** * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume * @vol: ntfs super block describing device whose mft mirror to load * * Return TRUE on success or FALSE on error. */ static BOOL load_and_init_mft_mirror(ntfs_volume *vol) { struct inode *tmp_ino; ntfs_inode *tmp_ni; ntfs_debug("Entering."); /* Get mft mirror inode. */ tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr); if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { if (!IS_ERR(tmp_ino)) iput(tmp_ino); /* Caller will display error message. */ return FALSE; } /* * Re-initialize some specifics about $MFTMirr's inode as * ntfs_read_inode() will have set up the default ones. */ /* Set uid and gid to root. */ tmp_ino->i_uid = tmp_ino->i_gid = 0; /* Regular file. No access for anyone. */ tmp_ino->i_mode = S_IFREG; /* No VFS initiated operations allowed for $MFTMirr. */ tmp_ino->i_op = &ntfs_empty_inode_ops; tmp_ino->i_fop = &ntfs_empty_file_ops; /* Put in our special address space operations. */ tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; tmp_ni = NTFS_I(tmp_ino); /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ NInoSetMstProtected(tmp_ni); /* * Set up our little cheat allowing us to reuse the async read io * completion handler for directories. */ tmp_ni->itype.index.block_size = vol->mft_record_size; tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; vol->mftmirr_ino = tmp_ino; ntfs_debug("Done."); return TRUE; } /** * check_mft_mirror - compare contents of the mft mirror with the mft * @vol: ntfs super block describing device whose mft mirror to check * * Return TRUE on success or FALSE on error. * * Note, this function also results in the mft mirror runlist being completely * mapped into memory. The mft mirror write code requires this and will BUG() * should it find an unmapped runlist element. */ static BOOL check_mft_mirror(ntfs_volume *vol) { unsigned long index; struct super_block *sb = vol->sb; ntfs_inode *mirr_ni; struct page *mft_page, *mirr_page; u8 *kmft, *kmirr; runlist_element *rl, rl2[2]; int mrecs_per_page, i; ntfs_debug("Entering."); /* Compare contents of $MFT and $MFTMirr. */ mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size; BUG_ON(!mrecs_per_page); BUG_ON(!vol->mftmirr_size); mft_page = mirr_page = NULL; kmft = kmirr = NULL; index = i = 0; do { u32 bytes; /* Switch pages if necessary. */ if (!(i % mrecs_per_page)) { if (index) { ntfs_unmap_page(mft_page); ntfs_unmap_page(mirr_page); } /* Get the $MFT page. */ mft_page = ntfs_map_page(vol->mft_ino->i_mapping, index); if (IS_ERR(mft_page)) { ntfs_error(sb, "Failed to read $MFT."); return FALSE; } kmft = page_address(mft_page); /* Get the $MFTMirr page. */ mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping, index); if (IS_ERR(mirr_page)) { ntfs_error(sb, "Failed to read $MFTMirr."); goto mft_unmap_out; } kmirr = page_address(mirr_page); ++index; } /* Make sure the record is ok. */ if (ntfs_is_baad_recordp((le32*)kmft)) { ntfs_error(sb, "Incomplete multi sector transfer " "detected in mft record %i.", i); mm_unmap_out: ntfs_unmap_page(mirr_page); mft_unmap_out: ntfs_unmap_page(mft_page); return FALSE; } if (ntfs_is_baad_recordp((le32*)kmirr)) { ntfs_error(sb, "Incomplete multi sector transfer " "detected in mft mirror record %i.", i); goto mm_unmap_out; } /* Get the amount of data in the current record. */ bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); if (!bytes || bytes > vol->mft_record_size) { bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); if (!bytes || bytes > vol->mft_record_size) bytes = vol->mft_record_size; } /* Compare the two records. */ if (memcmp(kmft, kmirr, bytes)) { ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " "match. Run ntfsfix or chkdsk.", i); goto mm_unmap_out; } kmft += vol->mft_record_size; kmirr += vol->mft_record_size; } while (++i < vol->mftmirr_size); /* Release the last pages. */ ntfs_unmap_page(mft_page); ntfs_unmap_page(mirr_page); /* Construct the mft mirror runlist by hand. */ rl2[0].vcn = 0; rl2[0].lcn = vol->mftmirr_lcn; rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + vol->cluster_size - 1) / vol->cluster_size; rl2[1].vcn = rl2[0].length; rl2[1].lcn = LCN_ENOENT; rl2[1].length = 0; /* * Because we have just read all of the mft mirror, we know we have * mapped the full runlist for it. */ mirr_ni = NTFS_I(vol->mftmirr_ino); down_read(&mirr_ni->runlist.lock); rl = mirr_ni->runlist.rl; /* Compare the two runlists. They must be identical. */ i = 0; do { if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || rl2[i].length != rl[i].length) { ntfs_error(sb, "$MFTMirr location mismatch. " "Run chkdsk."); up_read(&mirr_ni->runlist.lock); return FALSE; } } while (rl2[i++].length); up_read(&mirr_ni->runlist.lock); ntfs_debug("Done."); return TRUE; } /** * load_and_check_logfile - load and check the logfile inode for a volume * @vol: ntfs super block describing device whose logfile to load * * Return TRUE on success or FALSE on error. */ static BOOL load_and_check_logfile(ntfs_volume *vol) { struct inode *tmp_ino; ntfs_debug("Entering."); tmp_ino = ntfs_iget(vol->sb, FILE_LogFile); if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { if (!IS_ERR(tmp_ino)) iput(tmp_ino); /* Caller will display error message. */ return FALSE; } if (!ntfs_check_logfile(tmp_ino)) { iput(tmp_ino); /* ntfs_check_logfile() will have displayed error output. */ return FALSE; } vol->logfile_ino = tmp_ino; ntfs_debug("Done."); return TRUE; } /** * load_and_init_quota - load and setup the quota file for a volume if present * @vol: ntfs super block describing device whose quota file to load * * Return TRUE on success or FALSE on error. If $Quota is not present, we * leave vol->quota_ino as NULL and return success. */ static BOOL load_and_init_quota(ntfs_volume *vol) { MFT_REF mref; struct inode *tmp_ino; ntfs_name *name = NULL; static const ntfschar Quota[7] = { const_cpu_to_le16('$'), const_cpu_to_le16('Q'), const_cpu_to_le16('u'), const_cpu_to_le16('o'), const_cpu_to_le16('t'), const_cpu_to_le16('a'), 0 }; static ntfschar Q[3] = { const_cpu_to_le16('$'), const_cpu_to_le16('Q'), 0 }; ntfs_debug("Entering."); /* * Find the inode number for the quota file by looking up the filename * $Quota in the extended system files directory $Extend. */ down(&vol->extend_ino->i_sem); mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, &name); up(&vol->extend_ino->i_sem); if (IS_ERR_MREF(mref)) { /* * If the file does not exist, quotas are disabled and have * never been enabled on this volume, just return success. */ if (MREF_ERR(mref) == -ENOENT) { ntfs_debug("$Quota not present. Volume does not have " "quotas enabled."); /* * No need to try to set quotas out of date if they are * not enabled. */ NVolSetQuotaOutOfDate(vol); return TRUE; } /* A real error occured. */ ntfs_error(vol->sb, "Failed to find inode number for $Quota."); return FALSE; } /* We do not care for the type of match that was found. */ if (name) kfree(name); /* Get the inode. */ tmp_ino = ntfs_iget(vol->sb, MREF(mref)); if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { if (!IS_ERR(tmp_ino)) iput(tmp_ino); ntfs_error(vol->sb, "Failed to load $Quota."); return FALSE; } vol->quota_ino = tmp_ino; /* Get the $Q index allocation attribute. */ tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2); if (IS_ERR(tmp_ino)) { ntfs_error(vol->sb, "Failed to load $Quota/$Q index."); return FALSE; } vol->quota_q_ino = tmp_ino; ntfs_debug("Done."); return TRUE; } /** * load_and_init_attrdef - load the attribute definitions table for a volume * @vol: ntfs super block describing device whose attrdef to load * * Return TRUE on success or FALSE on error. */ static BOOL load_and_init_attrdef(ntfs_volume *vol) { struct super_block *sb = vol->sb; struct inode *ino; struct page *page; unsigned long index, max_index; unsigned int size; ntfs_debug("Entering."); /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ ino = ntfs_iget(sb, FILE_AttrDef); if (IS_ERR(ino) || is_bad_inode(ino)) { if (!IS_ERR(ino)) iput(ino); goto failed; } /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ if (!ino->i_size || ino->i_size > 0x7fffffff) goto iput_failed; vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(ino->i_size); if (!vol->attrdef) goto iput_failed; index = 0; max_index = ino->i_size >> PAGE_CACHE_SHIFT; size = PAGE_CACHE_SIZE; while (index < max_index) { /* Read the attrdef table and copy it into the linear buffer. */ read_partial_attrdef_page: page = ntfs_map_page(ino->i_mapping, index); if (IS_ERR(page)) goto free_iput_failed; memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT), page_address(page), size); ntfs_unmap_page(page); }; if (size == PAGE_CACHE_SIZE) { size = ino->i_size & ~PAGE_CACHE_MASK; if (size) goto read_partial_attrdef_page; } vol->attrdef_size = ino->i_size; ntfs_debug("Read %llu bytes from $AttrDef.", ino->i_size); iput(ino); return TRUE; free_iput_failed: ntfs_free(vol->attrdef); vol->attrdef = NULL; iput_failed: iput(ino); failed: ntfs_error(sb, "Failed to initialize attribute definition table."); return FALSE; } #endif /* NTFS_RW */ /** * load_and_init_upcase - load the upcase table for an ntfs volume * @vol: ntfs super block describing device whose upcase to load * * Return TRUE on success or FALSE on error. */ static BOOL load_and_init_upcase(ntfs_volume *vol) { struct super_block *sb = vol->sb; struct inode *ino; struct page *page; unsigned long index, max_index; unsigned int size; int i, max; ntfs_debug("Entering."); /* Read upcase table and setup vol->upcase and vol->upcase_len. */ ino = ntfs_iget(sb, FILE_UpCase); if (IS_ERR(ino) || is_bad_inode(ino)) { if (!IS_ERR(ino)) iput(ino); goto upcase_failed; } /* * The upcase size must not be above 64k Unicode characters, must not * be zero and must be a multiple of sizeof(ntfschar). */ if (!ino->i_size || ino->i_size & (sizeof(ntfschar) - 1) || ino->i_size > 64ULL * 1024 * sizeof(ntfschar)) goto iput_upcase_failed; vol->upcase = (ntfschar*)ntfs_malloc_nofs(ino->i_size); if (!vol->upcase) goto iput_upcase_failed; index = 0; max_index = ino->i_size >> PAGE_CACHE_SHIFT; size = PAGE_CACHE_SIZE; while (index < max_index) { /* Read the upcase table and copy it into the linear buffer. */ read_partial_upcase_page: page = ntfs_map_page(ino->i_mapping, index); if (IS_ERR(page)) goto iput_upcase_failed; memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT), page_address(page), size); ntfs_unmap_page(page); }; if (size == PAGE_CACHE_SIZE) { size = ino->i_size & ~PAGE_CACHE_MASK; if (size) goto read_partial_upcase_page; } vol->upcase_len = ino->i_size >> UCHAR_T_SIZE_BITS; ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", ino->i_size, 64 * 1024 * sizeof(ntfschar)); iput(ino); down(&ntfs_lock); if (!default_upcase) { ntfs_debug("Using volume specified $UpCase since default is " "not present."); up(&ntfs_lock); return TRUE; } max = default_upcase_len; if (max > vol->upcase_len) max = vol->upcase_len; for (i = 0; i < max; i++) if (vol->upcase[i] != default_upcase[i]) break; if (i == max) { ntfs_free(vol->upcase); vol->upcase = default_upcase; vol->upcase_len = max; ntfs_nr_upcase_users++; up(&ntfs_lock); ntfs_debug("Volume specified $UpCase matches default. Using " "default."); return TRUE; } up(&ntfs_lock); ntfs_debug("Using volume specified $UpCase since it does not match " "the default."); return TRUE; iput_upcase_failed: iput(ino); ntfs_free(vol->upcase); vol->upcase = NULL; upcase_failed: down(&ntfs_lock); if (default_upcase) { vol->upcase = default_upcase; vol->upcase_len = default_upcase_len; ntfs_nr_upcase_users++; up(&ntfs_lock); ntfs_error(sb, "Failed to load $UpCase from the volume. Using " "default."); return TRUE; } up(&ntfs_lock); ntfs_error(sb, "Failed to initialize upcase table."); return FALSE; } /** * load_system_files - open the system files using normal functions * @vol: ntfs super block describing device whose system files to load * * Open the system files with normal access functions and complete setting up * the ntfs super block @vol. * * Return TRUE on success or FALSE on error. */ static BOOL load_system_files(ntfs_volume *vol) { struct super_block *sb = vol->sb; MFT_RECORD *m; VOLUME_INFORMATION *vi; ntfs_attr_search_ctx *ctx; ntfs_debug("Entering."); #ifdef NTFS_RW /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { static const char *es1 = "Failed to load $MFTMirr"; static const char *es2 = "$MFTMirr does not match $MFT"; static const char *es3 = ". Run ntfsfix and/or chkdsk."; /* If a read-write mount, convert it to a read-only mount. */ if (!(sb->s_flags & MS_RDONLY)) { if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=" "continue nor on_errors=" "remount-ro was specified%s", !vol->mftmirr_ino ? es1 : es2, es3); goto iput_mirr_err_out; } sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; ntfs_error(sb, "%s. Mounting read-only%s", !vol->mftmirr_ino ? es1 : es2, es3); } else ntfs_warning(sb, "%s. Will not be able to remount " "read-write%s", !vol->mftmirr_ino ? es1 : es2, es3); /* This will prevent a read-write remount. */ NVolSetErrors(vol); } #endif /* NTFS_RW */ /* Get mft bitmap attribute inode. */ vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0); if (IS_ERR(vol->mftbmp_ino)) { ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute."); goto iput_mirr_err_out; } /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ if (!load_and_init_upcase(vol)) goto iput_mftbmp_err_out; #ifdef NTFS_RW /* * Read attribute definitions table and setup @vol->attrdef and * @vol->attrdef_size. */ if (!load_and_init_attrdef(vol)) goto iput_upcase_err_out; #endif /* NTFS_RW */ /* * Get the cluster allocation bitmap inode and verify the size, no * need for any locking at this stage as we are already running * exclusively as we are mount in progress task. */ vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap); if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { if (!IS_ERR(vol->lcnbmp_ino)) iput(vol->lcnbmp_ino); goto bitmap_failed; } if ((vol->nr_clusters + 7) >> 3 > vol->lcnbmp_ino->i_size) { iput(vol->lcnbmp_ino); bitmap_failed: ntfs_error(sb, "Failed to load $Bitmap."); goto iput_attrdef_err_out; } /* * Get the volume inode and setup our cache of the volume flags and * version. */ vol->vol_ino = ntfs_iget(sb, FILE_Volume); if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) { if (!IS_ERR(vol->vol_ino)) iput(vol->vol_ino); volume_failed: ntfs_error(sb, "Failed to load $Volume."); goto iput_lcnbmp_err_out; } m = map_mft_record(NTFS_I(vol->vol_ino)); if (IS_ERR(m)) { iput_volume_failed: iput(vol->vol_ino); goto volume_failed; } if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) { ntfs_error(sb, "Failed to get attribute search context."); goto get_ctx_vol_failed; } if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, ctx) || ctx->attr->non_resident || ctx->attr->flags) { err_put_vol: ntfs_attr_put_search_ctx(ctx); get_ctx_vol_failed: unmap_mft_record(NTFS_I(vol->vol_ino)); goto iput_volume_failed; } vi = (VOLUME_INFORMATION*)((char*)ctx->attr + le16_to_cpu(ctx->attr->data.resident.value_offset)); /* Some bounds checks. */ if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + le32_to_cpu(ctx->attr->data.resident.value_length) > (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) goto err_put_vol; /* Copy the volume flags and version to the ntfs_volume structure. */ vol->vol_flags = vi->flags; vol->major_ver = vi->major_ver; vol->minor_ver = vi->minor_ver; ntfs_attr_put_search_ctx(ctx); unmap_mft_record(NTFS_I(vol->vol_ino)); printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver, vol->minor_ver); #ifdef NTFS_RW /* Make sure that no unsupported volume flags are set. */ if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { static const char *es1a = "Volume is dirty"; static const char *es1b = "Volume has unsupported flags set"; static const char *es2 = ". Run chkdsk and mount in Windows."; const char *es1; es1 = vol->vol_flags & VOLUME_IS_DIRTY ? es1a : es1b; /* If a read-write mount, convert it to a read-only mount. */ if (!(sb->s_flags & MS_RDONLY)) { if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=" "continue nor on_errors=" "remount-ro was specified%s", es1, es2); goto iput_vol_err_out; } sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); } else ntfs_warning(sb, "%s. Will not be able to remount " "read-write%s", es1, es2); /* * Do not set NVolErrors() because ntfs_remount() re-checks the * flags which we need to do in case any flags have changed. */ } /* * Get the inode for the logfile, check it and determine if the volume * was shutdown cleanly. */ if (!load_and_check_logfile(vol) || !ntfs_is_logfile_clean(vol->logfile_ino)) { static const char *es1a = "Failed to load $LogFile"; static const char *es1b = "$LogFile is not clean"; static const char *es2 = ". Mount in Windows."; const char *es1; es1 = !vol->logfile_ino ? es1a : es1b; /* If a read-write mount, convert it to a read-only mount. */ if (!(sb->s_flags & MS_RDONLY)) { if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=" "continue nor on_errors=" "remount-ro was specified%s", es1, es2); goto iput_logfile_err_out; } sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); } else ntfs_warning(sb, "%s. Will not be able to remount " "read-write%s", es1, es2); /* This will prevent a read-write remount. */ NVolSetErrors(vol); } /* If (still) a read-write mount, mark the volume dirty. */ if (!(sb->s_flags & MS_RDONLY) && ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { static const char *es1 = "Failed to set dirty bit in volume " "information flags"; static const char *es2 = ". Run chkdsk."; /* Convert to a read-only mount. */ if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=continue nor " "on_errors=remount-ro was specified%s", es1, es2); goto iput_logfile_err_out; } ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; /* * Do not set NVolErrors() because ntfs_remount() might manage * to set the dirty flag in which case all would be well. */ } #if 0 // TODO: Enable this code once we start modifying anything that is // different between NTFS 1.2 and 3.x... /* * If (still) a read-write mount, set the NT4 compatibility flag on * newer NTFS version volumes. */ if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) && ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { static const char *es1 = "Failed to set NT4 compatibility flag"; static const char *es2 = ". Run chkdsk."; /* Convert to a read-only mount. */ if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=continue nor " "on_errors=remount-ro was specified%s", es1, es2); goto iput_logfile_err_out; } ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; NVolSetErrors(vol); } #endif /* If (still) a read-write mount, empty the logfile. */ if (!(sb->s_flags & MS_RDONLY) && !ntfs_empty_logfile(vol->logfile_ino)) { static const char *es1 = "Failed to empty $LogFile"; static const char *es2 = ". Mount in Windows."; /* Convert to a read-only mount. */ if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=continue nor " "on_errors=remount-ro was specified%s", es1, es2); goto iput_logfile_err_out; } ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; NVolSetErrors(vol); } #endif /* NTFS_RW */ /* Get the root directory inode. */ vol->root_ino = ntfs_iget(sb, FILE_root); if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) { if (!IS_ERR(vol->root_ino)) iput(vol->root_ino); ntfs_error(sb, "Failed to load root directory."); goto iput_logfile_err_out; } /* If on NTFS versions before 3.0, we are done. */ if (vol->major_ver < 3) return TRUE; /* NTFS 3.0+ specific initialization. */ /* Get the security descriptors inode. */ vol->secure_ino = ntfs_iget(sb, FILE_Secure); if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) { if (!IS_ERR(vol->secure_ino)) iput(vol->secure_ino); ntfs_error(sb, "Failed to load $Secure."); goto iput_root_err_out; } // FIXME: Initialize security. /* Get the extended system files' directory inode. */ vol->extend_ino = ntfs_iget(sb, FILE_Extend); if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) { if (!IS_ERR(vol->extend_ino)) iput(vol->extend_ino); ntfs_error(sb, "Failed to load $Extend."); goto iput_sec_err_out; } #ifdef NTFS_RW /* Find the quota file, load it if present, and set it up. */ if (!load_and_init_quota(vol)) { static const char *es1 = "Failed to load $Quota"; static const char *es2 = ". Run chkdsk."; /* If a read-write mount, convert it to a read-only mount. */ if (!(sb->s_flags & MS_RDONLY)) { if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=" "continue nor on_errors=" "remount-ro was specified%s", es1, es2); goto iput_quota_err_out; } sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); } else ntfs_warning(sb, "%s. Will not be able to remount " "read-write%s", es1, es2); /* This will prevent a read-write remount. */ NVolSetErrors(vol); } /* If (still) a read-write mount, mark the quotas out of date. */ if (!(sb->s_flags & MS_RDONLY) && !ntfs_mark_quotas_out_of_date(vol)) { static const char *es1 = "Failed to mark quotas out of date"; static const char *es2 = ". Run chkdsk."; /* Convert to a read-only mount. */ if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | ON_ERRORS_CONTINUE))) { ntfs_error(sb, "%s and neither on_errors=continue nor " "on_errors=remount-ro was specified%s", es1, es2); goto iput_quota_err_out; } ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; NVolSetErrors(vol); } // TODO: Delete or checkpoint the $UsnJrnl if it exists. #endif /* NTFS_RW */ return TRUE; #ifdef NTFS_RW iput_quota_err_out: if (vol->quota_q_ino) iput(vol->quota_q_ino); if (vol->quota_ino) iput(vol->quota_ino); iput(vol->extend_ino); #endif /* NTFS_RW */ iput_sec_err_out: iput(vol->secure_ino); iput_root_err_out: iput(vol->root_ino); iput_logfile_err_out: #ifdef NTFS_RW if (vol->logfile_ino) iput(vol->logfile_ino); iput_vol_err_out: #endif /* NTFS_RW */ iput(vol->vol_ino); iput_lcnbmp_err_out: iput(vol->lcnbmp_ino); iput_attrdef_err_out: vol->attrdef_size = 0; if (vol->attrdef) { ntfs_free(vol->attrdef); vol->attrdef = NULL; } #ifdef NTFS_RW iput_upcase_err_out: #endif /* NTFS_RW */ vol->upcase_len = 0; down(&ntfs_lock); if (vol->upcase == default_upcase) { ntfs_nr_upcase_users--; vol->upcase = NULL; } up(&ntfs_lock); if (vol->upcase) { ntfs_free(vol->upcase); vol->upcase = NULL; } iput_mftbmp_err_out: iput(vol->mftbmp_ino); iput_mirr_err_out: #ifdef NTFS_RW if (vol->mftmirr_ino) iput(vol->mftmirr_ino); #endif /* NTFS_RW */ return FALSE; } /** * ntfs_put_super - called by the vfs to unmount a volume * @sb: vfs superblock of volume to unmount * * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when * the volume is being unmounted (umount system call has been invoked) and it * releases all inodes and memory belonging to the NTFS specific part of the * super block. */ static void ntfs_put_super(struct super_block *sb) { ntfs_volume *vol = NTFS_SB(sb); ntfs_debug("Entering."); #ifdef NTFS_RW /* * Commit all inodes while they are still open in case some of them * cause others to be dirtied. */ ntfs_commit_inode(vol->vol_ino); /* NTFS 3.0+ specific. */ if (vol->major_ver >= 3) { if (vol->quota_q_ino) ntfs_commit_inode(vol->quota_q_ino); if (vol->quota_ino) ntfs_commit_inode(vol->quota_ino); if (vol->extend_ino) ntfs_commit_inode(vol->extend_ino); if (vol->secure_ino) ntfs_commit_inode(vol->secure_ino); } ntfs_commit_inode(vol->root_ino); down_write(&vol->lcnbmp_lock); ntfs_commit_inode(vol->lcnbmp_ino); up_write(&vol->lcnbmp_lock); down_write(&vol->mftbmp_lock); ntfs_commit_inode(vol->mftbmp_ino); up_write(&vol->mftbmp_lock); if (vol->logfile_ino) ntfs_commit_inode(vol->logfile_ino); if (vol->mftmirr_ino) ntfs_commit_inode(vol->mftmirr_ino); ntfs_commit_inode(vol->mft_ino); /* * If a read-write mount and no volume errors have occured, mark the * volume clean. Also, re-commit all affected inodes. */ if (!(sb->s_flags & MS_RDONLY)) { if (!NVolErrors(vol)) { if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) ntfs_warning(sb, "Failed to clear dirty bit " "in volume information " "flags. Run chkdsk."); ntfs_commit_inode(vol->vol_ino); ntfs_commit_inode(vol->root_ino); if (vol->mftmirr_ino) ntfs_commit_inode(vol->mftmirr_ino); ntfs_commit_inode(vol->mft_ino); } else { ntfs_warning(sb, "Volume has errors. Leaving volume " "marked dirty. Run chkdsk."); } } #endif /* NTFS_RW */ iput(vol->vol_ino); vol->vol_ino = NULL; /* NTFS 3.0+ specific clean up. */ if (vol->major_ver >= 3) { #ifdef NTFS_RW if (vol->quota_q_ino) { iput(vol->quota_q_ino); vol->quota_q_ino = NULL; } if (vol->quota_ino) { iput(vol->quota_ino); vol->quota_ino = NULL; } #endif /* NTFS_RW */ if (vol->extend_ino) { iput(vol->extend_ino); vol->extend_ino = NULL; } if (vol->secure_ino) { iput(vol->secure_ino); vol->secure_ino = NULL; } } iput(vol->root_ino); vol->root_ino = NULL; down_write(&vol->lcnbmp_lock); iput(vol->lcnbmp_ino); vol->lcnbmp_ino = NULL; up_write(&vol->lcnbmp_lock); down_write(&vol->mftbmp_lock); iput(vol->mftbmp_ino); vol->mftbmp_ino = NULL; up_write(&vol->mftbmp_lock); #ifdef NTFS_RW if (vol->logfile_ino) { iput(vol->logfile_ino); vol->logfile_ino = NULL; } if (vol->mftmirr_ino) { /* Re-commit the mft mirror and mft just in case. */ ntfs_commit_inode(vol->mftmirr_ino); ntfs_commit_inode(vol->mft_ino); iput(vol->mftmirr_ino); vol->mftmirr_ino = NULL; } /* * If any dirty inodes are left, throw away all mft data page cache * pages to allow a clean umount. This should never happen any more * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as * the underlying mft records are written out and cleaned. If it does, * happen anyway, we want to know... */ ntfs_commit_inode(vol->mft_ino); write_inode_now(vol->mft_ino, 1); if (!list_empty(&sb->s_dirty)) { const char *s1, *s2; down(&vol->mft_ino->i_sem); truncate_inode_pages(vol->mft_ino->i_mapping, 0); up(&vol->mft_ino->i_sem); write_inode_now(vol->mft_ino, 1); if (!list_empty(&sb->s_dirty)) { static const char *_s1 = "inodes"; static const char *_s2 = ""; s1 = _s1; s2 = _s2; } else { static const char *_s1 = "mft pages"; static const char *_s2 = "They have been thrown " "away. "; s1 = _s1; s2 = _s2; } ntfs_error(sb, "Dirty %s found at umount time. %sYou should " "run chkdsk. Please email " "linux-ntfs-dev@lists.sourceforge.net and say " "that you saw this message. Thank you.", s1, s2); } #endif /* NTFS_RW */ iput(vol->mft_ino); vol->mft_ino = NULL; /* Throw away the table of attribute definitions. */ vol->attrdef_size = 0; if (vol->attrdef) { ntfs_free(vol->attrdef); vol->attrdef = NULL; } vol->upcase_len = 0; /* * Destroy the global default upcase table if necessary. Also decrease * the number of upcase users if we are a user. */ down(&ntfs_lock); if (vol->upcase == default_upcase) { ntfs_nr_upcase_users--; vol->upcase = NULL; } if (!ntfs_nr_upcase_users && default_upcase) { ntfs_free(default_upcase); default_upcase = NULL; } if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) free_compression_buffers(); up(&ntfs_lock); if (vol->upcase) { ntfs_free(vol->upcase); vol->upcase = NULL; } if (vol->nls_map) { unload_nls(vol->nls_map); vol->nls_map = NULL; } sb->s_fs_info = NULL; kfree(vol); return; } /** * get_nr_free_clusters - return the number of free clusters on a volume * @vol: ntfs volume for which to obtain free cluster count * * Calculate the number of free clusters on the mounted NTFS volume @vol. We * actually calculate the number of clusters in use instead because this * allows us to not care about partial pages as these will be just zero filled * and hence not be counted as allocated clusters. * * The only particularity is that clusters beyond the end of the logical ntfs * volume will be marked as allocated to prevent errors which means we have to * discount those at the end. This is important as the cluster bitmap always * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside * the logical volume and marked in use when they are not as they do not exist. * * If any pages cannot be read we assume all clusters in the erroring pages are * in use. This means we return an underestimate on errors which is better than * an overestimate. */ static s64 get_nr_free_clusters(ntfs_volume *vol) { s64 nr_free = vol->nr_clusters; u32 *kaddr; struct address_space *mapping = vol->lcnbmp_ino->i_mapping; filler_t *readpage = (filler_t*)mapping->a_ops->readpage; struct page *page; unsigned long index, max_index; unsigned int max_size; ntfs_debug("Entering."); /* Serialize accesses to the cluster bitmap. */ down_read(&vol->lcnbmp_lock); /* * Convert the number of bits into bytes rounded up, then convert into * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one * full and one partial page max_index = 2. */ max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; /* Use multiples of 4 bytes. */ max_size = PAGE_CACHE_SIZE >> 2; ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%x.", max_index, max_size); for (index = 0UL; index < max_index; index++) { unsigned int i; /* * Read the page from page cache, getting it from backing store * if necessary, and increment the use count. */ page = read_cache_page(mapping, index, (filler_t*)readpage, NULL); /* Ignore pages which errored synchronously. */ if (IS_ERR(page)) { ntfs_debug("Sync read_cache_page() error. Skipping " "page (index 0x%lx).", index); nr_free -= PAGE_CACHE_SIZE * 8; continue; } wait_on_page_locked(page); /* Ignore pages which errored asynchronously. */ if (!PageUptodate(page)) { ntfs_debug("Async read_cache_page() error. Skipping " "page (index 0x%lx).", index); page_cache_release(page); nr_free -= PAGE_CACHE_SIZE * 8; continue; } kaddr = (u32*)kmap_atomic(page, KM_USER0); /* * For each 4 bytes, subtract the number of set bits. If this * is the last page and it is partial we don't really care as * it just means we do a little extra work but it won't affect * the result as all out of range bytes are set to zero by * ntfs_readpage(). */ for (i = 0; i < max_size; i++) nr_free -= (s64)hweight32(kaddr[i]); kunmap_atomic(kaddr, KM_USER0); page_cache_release(page); } ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1); /* * Fixup for eventual bits outside logical ntfs volume (see function * description above). */ if (vol->nr_clusters & 63) nr_free += 64 - (vol->nr_clusters & 63); up_read(&vol->lcnbmp_lock); /* If errors occured we may well have gone below zero, fix this. */ if (nr_free < 0) nr_free = 0; ntfs_debug("Exiting."); return nr_free; } /** * __get_nr_free_mft_records - return the number of free inodes on a volume * @vol: ntfs volume for which to obtain free inode count * * Calculate the number of free mft records (inodes) on the mounted NTFS * volume @vol. We actually calculate the number of mft records in use instead * because this allows us to not care about partial pages as these will be just * zero filled and hence not be counted as allocated mft record. * * If any pages cannot be read we assume all mft records in the erroring pages * are in use. This means we return an underestimate on errors which is better * than an overestimate. * * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. */ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol) { s64 nr_free; u32 *kaddr; struct address_space *mapping = vol->mftbmp_ino->i_mapping; filler_t *readpage = (filler_t*)mapping->a_ops->readpage; struct page *page; unsigned long index, max_index; unsigned int max_size; ntfs_debug("Entering."); /* Number of mft records in file system (at this point in time). */ nr_free = vol->mft_ino->i_size >> vol->mft_record_size_bits; /* * Convert the maximum number of set bits into bytes rounded up, then * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we * have one full and one partial page max_index = 2. */ max_index = ((((NTFS_I(vol->mft_ino)->initialized_size >> vol->mft_record_size_bits) + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; /* Use multiples of 4 bytes. */ max_size = PAGE_CACHE_SIZE >> 2; ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " "0x%x.", max_index, max_size); for (index = 0UL; index < max_index; index++) { unsigned int i; /* * Read the page from page cache, getting it from backing store * if necessary, and increment the use count. */ page = read_cache_page(mapping, index, (filler_t*)readpage, NULL); /* Ignore pages which errored synchronously. */ if (IS_ERR(page)) { ntfs_debug("Sync read_cache_page() error. Skipping " "page (index 0x%lx).", index); nr_free -= PAGE_CACHE_SIZE * 8; continue; } wait_on_page_locked(page); /* Ignore pages which errored asynchronously. */ if (!PageUptodate(page)) { ntfs_debug("Async read_cache_page() error. Skipping " "page (index 0x%lx).", index); page_cache_release(page); nr_free -= PAGE_CACHE_SIZE * 8; continue; } kaddr = (u32*)kmap_atomic(page, KM_USER0); /* * For each 4 bytes, subtract the number of set bits. If this * is the last page and it is partial we don't really care as * it just means we do a little extra work but it won't affect * the result as all out of range bytes are set to zero by * ntfs_readpage(). */ for (i = 0; i < max_size; i++) nr_free -= (s64)hweight32(kaddr[i]); kunmap_atomic(kaddr, KM_USER0); page_cache_release(page); } ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", index - 1); /* If errors occured we may well have gone below zero, fix this. */ if (nr_free < 0) nr_free = 0; ntfs_debug("Exiting."); return nr_free; } /** * ntfs_statfs - return information about mounted NTFS volume * @sb: super block of mounted volume * @sfs: statfs structure in which to return the information * * Return information about the mounted NTFS volume @sb in the statfs structure * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is * called). We interpret the values to be correct of the moment in time at * which we are called. Most values are variable otherwise and this isn't just * the free values but the totals as well. For example we can increase the * total number of file nodes if we run out and we can keep doing this until * there is no more space on the volume left at all. * * Called from vfs_statfs which is used to handle the statfs, fstatfs, and * ustat system calls. * * Return 0 on success or -errno on error. */ static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs) { ntfs_volume *vol = NTFS_SB(sb); s64 size; ntfs_debug("Entering."); /* Type of filesystem. */ sfs->f_type = NTFS_SB_MAGIC; /* Optimal transfer block size. */ sfs->f_bsize = PAGE_CACHE_SIZE; /* * Total data blocks in file system in units of f_bsize and since * inodes are also stored in data blocs ($MFT is a file) this is just * the total clusters. */ sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> PAGE_CACHE_SHIFT; /* Free data blocks in file system in units of f_bsize. */ size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> PAGE_CACHE_SHIFT; if (size < 0LL) size = 0LL; /* Free blocks avail to non-superuser, same as above on NTFS. */ sfs->f_bavail = sfs->f_bfree = size; /* Serialize accesses to the inode bitmap. */ down_read(&vol->mftbmp_lock); /* Number of inodes in file system (at this point in time). */ sfs->f_files = vol->mft_ino->i_size >> vol->mft_record_size_bits; /* Free inodes in fs (based on current total count). */ sfs->f_ffree = __get_nr_free_mft_records(vol); up_read(&vol->mftbmp_lock); /* * File system id. This is extremely *nix flavour dependent and even * within Linux itself all fs do their own thing. I interpret this to * mean a unique id associated with the mounted fs and not the id * associated with the file system driver, the latter is already given * by the file system type in sfs->f_type. Thus we use the 64-bit * volume serial number splitting it into two 32-bit parts. We enter * the least significant 32-bits in f_fsid[0] and the most significant * 32-bits in f_fsid[1]. */ sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff; sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff; /* Maximum length of filenames. */ sfs->f_namelen = NTFS_MAX_NAME_LEN; return 0; } /** * The complete super operations. */ static struct super_operations ntfs_sops = { .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */ .put_inode = ntfs_put_inode, /* VFS: Called just before the inode reference count is decreased. */ #ifdef NTFS_RW //.dirty_inode = NULL, /* VFS: Called from // __mark_inode_dirty(). */ .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to disk. */ //.drop_inode = NULL, /* VFS: Called just after the // inode reference count has // been decreased to zero. // NOTE: The inode lock is // held. See fs/inode.c:: // generic_drop_inode(). */ //.delete_inode = NULL, /* VFS: Delete inode from disk. // Called when i_count becomes // 0 and i_nlink is also 0. */ //.write_super = NULL, /* Flush dirty super block to // disk. */ //.sync_fs = NULL, /* ? */ //.write_super_lockfs = NULL, /* ? */ //.unlockfs = NULL, /* ? */ #endif /* NTFS_RW */ .put_super = ntfs_put_super, /* Syscall: umount. */ .statfs = ntfs_statfs, /* Syscall: statfs */ .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is removed from memory. */ //.umount_begin = NULL, /* Forced umount. */ .show_options = ntfs_show_options, /* Show mount options in proc. */ }; /** * Declarations for NTFS specific export operations (fs/ntfs/namei.c). */ extern struct dentry *ntfs_get_parent(struct dentry *child_dent); extern struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh); /** * Export operations allowing NFS exporting of mounted NTFS partitions. * * We use the default ->decode_fh() and ->encode_fh() for now. Note that they * use 32 bits to store the inode number which is an unsigned long so on 64-bit * architectures is usually 64 bits so it would all fail horribly on huge * volumes. I guess we need to define our own encode and decode fh functions * that store 64-bit inode numbers at some point but for now we will ignore the * problem... * * We also use the default ->get_name() helper (used by ->decode_fh() via * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs * independent. * * The default ->get_parent() just returns -EACCES so we have to provide our * own and the default ->get_dentry() is incompatible with NTFS due to not * allowing the inode number 0 which is used in NTFS for the system file $MFT * and due to using iget() whereas NTFS needs ntfs_iget(). */ static struct export_operations ntfs_export_ops = { .get_parent = ntfs_get_parent, /* Find the parent of a given directory. */ .get_dentry = ntfs_get_dentry, /* Find a dentry for the inode given a file handle sub-fragment. */ }; /** * ntfs_fill_super - mount an ntfs files system * @sb: super block of ntfs file system to mount * @opt: string containing the mount options * @silent: silence error output * * ntfs_fill_super() is called by the VFS to mount the device described by @sb * with the mount otions in @data with the NTFS file system. * * If @silent is true, remain silent even if errors are detected. This is used * during bootup, when the kernel tries to mount the root file system with all * registered file systems one after the other until one succeeds. This implies * that all file systems except the correct one will quite correctly and * expectedly return an error, but nobody wants to see error messages when in * fact this is what is supposed to happen. * * NOTE: @sb->s_flags contains the mount options flags. */ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) { ntfs_volume *vol; struct buffer_head *bh; struct inode *tmp_ino; int result; ntfs_debug("Entering."); #ifndef NTFS_RW sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; #endif /* ! NTFS_RW */ /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS); vol = NTFS_SB(sb); if (!vol) { if (!silent) ntfs_error(sb, "Allocation of NTFS volume structure " "failed. Aborting mount..."); return -ENOMEM; } /* Initialize ntfs_volume structure. */ memset(vol, 0, sizeof(ntfs_volume)); vol->sb = sb; vol->upcase = NULL; vol->attrdef = NULL; vol->mft_ino = NULL; vol->mftbmp_ino = NULL; init_rwsem(&vol->mftbmp_lock); #ifdef NTFS_RW vol->mftmirr_ino = NULL; vol->logfile_ino = NULL; #endif /* NTFS_RW */ vol->lcnbmp_ino = NULL; init_rwsem(&vol->lcnbmp_lock); vol->vol_ino = NULL; vol->root_ino = NULL; vol->secure_ino = NULL; vol->extend_ino = NULL; #ifdef NTFS_RW vol->quota_ino = NULL; vol->quota_q_ino = NULL; #endif /* NTFS_RW */ vol->nls_map = NULL; /* * Default is group and other don't have any access to files or * directories while owner has full access. Further, files by default * are not executable but directories are of course browseable. */ vol->fmask = 0177; vol->dmask = 0077; unlock_kernel(); /* Important to get the mount options dealt with now. */ if (!parse_options(vol, (char*)opt)) goto err_out_now; /* * TODO: Fail safety check. In the future we should really be able to * cope with this being the case, but for now just bail out. */ if (bdev_hardsect_size(sb->s_bdev) > NTFS_BLOCK_SIZE) { if (!silent) ntfs_error(sb, "Device has unsupported hardsect_size."); goto err_out_now; } /* Setup the device access block size to NTFS_BLOCK_SIZE. */ if (sb_set_blocksize(sb, NTFS_BLOCK_SIZE) != NTFS_BLOCK_SIZE) { if (!silent) ntfs_error(sb, "Unable to set block size."); goto err_out_now; } /* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */ vol->nr_blocks = sb->s_bdev->bd_inode->i_size >> NTFS_BLOCK_SIZE_BITS; /* Read the boot sector and return unlocked buffer head to it. */ if (!(bh = read_ntfs_boot_sector(sb, silent))) { if (!silent) ntfs_error(sb, "Not an NTFS volume."); goto err_out_now; } /* * Extract the data from the boot sector and setup the ntfs super block * using it. */ result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); /* Initialize the cluster and mft allocators. */ ntfs_setup_allocators(vol); brelse(bh); if (!result) { if (!silent) ntfs_error(sb, "Unsupported NTFS filesystem."); goto err_out_now; } /* * TODO: When we start coping with sector sizes different from * NTFS_BLOCK_SIZE, we now probably need to set the blocksize of the * device (probably to NTFS_BLOCK_SIZE). */ /* Setup remaining fields in the super block. */ sb->s_magic = NTFS_SB_MAGIC; /* * Ntfs allows 63 bits for the file size, i.e. correct would be: * sb->s_maxbytes = ~0ULL >> 1; * But the kernel uses a long as the page cache page index which on * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel * defined to the maximum the page cache page index can cope with * without overflowing the index or to 2^63 - 1, whichever is smaller. */ sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_time_gran = 100; /* * Now load the metadata required for the page cache and our address * space operations to function. We do this by setting up a specialised * read_inode method and then just calling the normal iget() to obtain * the inode for $MFT which is sufficient to allow our normal inode * operations and associated address space operations to function. */ sb->s_op = &ntfs_sops; tmp_ino = new_inode(sb); if (!tmp_ino) { if (!silent) ntfs_error(sb, "Failed to load essential metadata."); goto err_out_now; } tmp_ino->i_ino = FILE_MFT; insert_inode_hash(tmp_ino); if (ntfs_read_inode_mount(tmp_ino) < 0) { if (!silent) ntfs_error(sb, "Failed to load essential metadata."); goto iput_tmp_ino_err_out_now; } down(&ntfs_lock); /* * The current mount is a compression user if the cluster size is * less than or equal 4kiB. */ if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { result = allocate_compression_buffers(); if (result) { ntfs_error(NULL, "Failed to allocate buffers " "for compression engine."); ntfs_nr_compression_users--; up(&ntfs_lock); goto iput_tmp_ino_err_out_now; } } /* * Generate the global default upcase table if necessary. Also * temporarily increment the number of upcase users to avoid race * conditions with concurrent (u)mounts. */ if (!default_upcase) default_upcase = generate_default_upcase(); ntfs_nr_upcase_users++; up(&ntfs_lock); /* * From now on, ignore @silent parameter. If we fail below this line, * it will be due to a corrupt fs or a system error, so we report it. */ /* * Open the system files with normal access functions and complete * setting up the ntfs super block. */ if (!load_system_files(vol)) { ntfs_error(sb, "Failed to load system files."); goto unl_upcase_iput_tmp_ino_err_out_now; } if ((sb->s_root = d_alloc_root(vol->root_ino))) { /* We increment i_count simulating an ntfs_iget(). */ atomic_inc(&vol->root_ino->i_count); ntfs_debug("Exiting, status successful."); /* Release the default upcase if it has no users. */ down(&ntfs_lock); if (!--ntfs_nr_upcase_users && default_upcase) { ntfs_free(default_upcase); default_upcase = NULL; } up(&ntfs_lock); sb->s_export_op = &ntfs_export_ops; lock_kernel(); return 0; } ntfs_error(sb, "Failed to allocate root directory."); /* Clean up after the successful load_system_files() call from above. */ // TODO: Use ntfs_put_super() instead of repeating all this code... // FIXME: Should mark the volume clean as the error is most likely // -ENOMEM. iput(vol->vol_ino); vol->vol_ino = NULL; /* NTFS 3.0+ specific clean up. */ if (vol->major_ver >= 3) { #ifdef NTFS_RW if (vol->quota_q_ino) { iput(vol->quota_q_ino); vol->quota_q_ino = NULL; } if (vol->quota_ino) { iput(vol->quota_ino); vol->quota_ino = NULL; } #endif /* NTFS_RW */ if (vol->extend_ino) { iput(vol->extend_ino); vol->extend_ino = NULL; } if (vol->secure_ino) { iput(vol->secure_ino); vol->secure_ino = NULL; } } iput(vol->root_ino); vol->root_ino = NULL; iput(vol->lcnbmp_ino); vol->lcnbmp_ino = NULL; iput(vol->mftbmp_ino); vol->mftbmp_ino = NULL; #ifdef NTFS_RW if (vol->logfile_ino) { iput(vol->logfile_ino); vol->logfile_ino = NULL; } if (vol->mftmirr_ino) { iput(vol->mftmirr_ino); vol->mftmirr_ino = NULL; } #endif /* NTFS_RW */ /* Throw away the table of attribute definitions. */ vol->attrdef_size = 0; if (vol->attrdef) { ntfs_free(vol->attrdef); vol->attrdef = NULL; } vol->upcase_len = 0; down(&ntfs_lock); if (vol->upcase == default_upcase) { ntfs_nr_upcase_users--; vol->upcase = NULL; } up(&ntfs_lock); if (vol->upcase) { ntfs_free(vol->upcase); vol->upcase = NULL; } if (vol->nls_map) { unload_nls(vol->nls_map); vol->nls_map = NULL; } /* Error exit code path. */ unl_upcase_iput_tmp_ino_err_out_now: /* * Decrease the number of upcase users and destroy the global default * upcase table if necessary. */ down(&ntfs_lock); if (!--ntfs_nr_upcase_users && default_upcase) { ntfs_free(default_upcase); default_upcase = NULL; } if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) free_compression_buffers(); up(&ntfs_lock); iput_tmp_ino_err_out_now: iput(tmp_ino); if (vol->mft_ino && vol->mft_ino != tmp_ino) iput(vol->mft_ino); vol->mft_ino = NULL; /* * This is needed to get ntfs_clear_extent_inode() called for each * inode we have ever called ntfs_iget()/iput() on, otherwise we A) * leak resources and B) a subsequent mount fails automatically due to * ntfs_iget() never calling down into our ntfs_read_locked_inode() * method again... FIXME: Do we need to do this twice now because of * attribute inodes? I think not, so leave as is for now... (AIA) */ if (invalidate_inodes(sb)) { ntfs_error(sb, "Busy inodes left. This is most likely a NTFS " "driver bug."); /* Copied from fs/super.c. I just love this message. (-; */ printk("NTFS: Busy inodes after umount. Self-destruct in 5 " "seconds. Have a nice day...\n"); } /* Errors at this stage are irrelevant. */ err_out_now: lock_kernel(); sb->s_fs_info = NULL; kfree(vol); ntfs_debug("Failed, returning -EINVAL."); return -EINVAL; } /* * This is a slab cache to optimize allocations and deallocations of Unicode * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN * (255) Unicode characters + a terminating NULL Unicode character. */ kmem_cache_t *ntfs_name_cache; /* Slab caches for efficient allocation/deallocation of of inodes. */ kmem_cache_t *ntfs_inode_cache; kmem_cache_t *ntfs_big_inode_cache; /* Init once constructor for the inode slab cache. */ static void ntfs_big_inode_init_once(void *foo, kmem_cache_t *cachep, unsigned long flags) { ntfs_inode *ni = (ntfs_inode *)foo; if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) inode_init_once(VFS_I(ni)); } /* * Slab caches to optimize allocations and deallocations of attribute search * contexts and index contexts, respectively. */ kmem_cache_t *ntfs_attr_ctx_cache; kmem_cache_t *ntfs_index_ctx_cache; /* Driver wide semaphore. */ DECLARE_MUTEX(ntfs_lock); static struct super_block *ntfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super); } static struct file_system_type ntfs_fs_type = { .owner = THIS_MODULE, .name = "ntfs", .get_sb = ntfs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; /* Stable names for the slab caches. */ static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache"; static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache"; static const char ntfs_name_cache_name[] = "ntfs_name_cache"; static const char ntfs_inode_cache_name[] = "ntfs_inode_cache"; static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache"; static int __init init_ntfs_fs(void) { int err = 0; /* This may be ugly but it results in pretty output so who cares. (-8 */ printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/" #ifdef NTFS_RW "W" #else "O" #endif #ifdef DEBUG " DEBUG" #endif #ifdef MODULE " MODULE" #endif "].\n"); ntfs_debug("Debug messages are enabled."); ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name, sizeof(ntfs_index_context), 0 /* offset */, SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); if (!ntfs_index_ctx_cache) { printk(KERN_CRIT "NTFS: Failed to create %s!\n", ntfs_index_ctx_cache_name); goto ictx_err_out; } ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name, sizeof(ntfs_attr_search_ctx), 0 /* offset */, SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); if (!ntfs_attr_ctx_cache) { printk(KERN_CRIT "NTFS: Failed to create %s!\n", ntfs_attr_ctx_cache_name); goto actx_err_out; } ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name, (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (!ntfs_name_cache) { printk(KERN_CRIT "NTFS: Failed to create %s!\n", ntfs_name_cache_name); goto name_err_out; } ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name, sizeof(ntfs_inode), 0, SLAB_RECLAIM_ACCOUNT, NULL, NULL); if (!ntfs_inode_cache) { printk(KERN_CRIT "NTFS: Failed to create %s!\n", ntfs_inode_cache_name); goto inode_err_out; } ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name, sizeof(big_ntfs_inode), 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, ntfs_big_inode_init_once, NULL); if (!ntfs_big_inode_cache) { printk(KERN_CRIT "NTFS: Failed to create %s!\n", ntfs_big_inode_cache_name); goto big_inode_err_out; } /* Register the ntfs sysctls. */ err = ntfs_sysctl(1); if (err) { printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n"); goto sysctl_err_out; } err = register_filesystem(&ntfs_fs_type); if (!err) { ntfs_debug("NTFS driver registered successfully."); return 0; /* Success! */ } printk(KERN_CRIT "NTFS: Failed to register NTFS file system driver!\n"); sysctl_err_out: kmem_cache_destroy(ntfs_big_inode_cache); big_inode_err_out: kmem_cache_destroy(ntfs_inode_cache); inode_err_out: kmem_cache_destroy(ntfs_name_cache); name_err_out: kmem_cache_destroy(ntfs_attr_ctx_cache); actx_err_out: kmem_cache_destroy(ntfs_index_ctx_cache); ictx_err_out: if (!err) { printk(KERN_CRIT "NTFS: Aborting NTFS file system driver " "registration...\n"); err = -ENOMEM; } return err; } static void __exit exit_ntfs_fs(void) { int err = 0; ntfs_debug("Unregistering NTFS driver."); unregister_filesystem(&ntfs_fs_type); if (kmem_cache_destroy(ntfs_big_inode_cache) && (err = 1)) printk(KERN_CRIT "NTFS: Failed to destory %s.\n", ntfs_big_inode_cache_name); if (kmem_cache_destroy(ntfs_inode_cache) && (err = 1)) printk(KERN_CRIT "NTFS: Failed to destory %s.\n", ntfs_inode_cache_name); if (kmem_cache_destroy(ntfs_name_cache) && (err = 1)) printk(KERN_CRIT "NTFS: Failed to destory %s.\n", ntfs_name_cache_name); if (kmem_cache_destroy(ntfs_attr_ctx_cache) && (err = 1)) printk(KERN_CRIT "NTFS: Failed to destory %s.\n", ntfs_attr_ctx_cache_name); if (kmem_cache_destroy(ntfs_index_ctx_cache) && (err = 1)) printk(KERN_CRIT "NTFS: Failed to destory %s.\n", ntfs_index_ctx_cache_name); if (err) printk(KERN_CRIT "NTFS: This causes memory to leak! There is " "probably a BUG in the driver! Please report " "you saw this message to " "linux-ntfs-dev@lists.sourceforge.net\n"); /* Unregister the ntfs sysctls. */ ntfs_sysctl(0); } MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>"); MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2004 Anton Altaparmakov"); MODULE_VERSION(NTFS_VERSION); MODULE_LICENSE("GPL"); #ifdef DEBUG module_param(debug_msgs, bool, 0); MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); #endif module_init(init_ntfs_fs) module_exit(exit_ntfs_fs)